Letter, 24.06.1959
Letter (hand-written), A.P. Ershov->Matheny, 29.07.1959
Letter, 07.09.1959
Letter, A.P. Ershov->J. Carr III, 09.09.1959
Letter, A.P. Ershov->J. Carr III, 08.10.1959Thanks for the letter with a new version of the scientific exchange program and for the received materials
Letter, A.P. Ershov->J. Carr III, 05.11.1959
Letter, A.P. Ershov->E. J. Guerin, 11.11.1959
Letter, A.P. Ershov->A. J. Perlis, 08.12.1959
Letter, A.P. Ershov->E. J. Guerin, 08.12.1959
Covering letter, A.P. Ershov->Leiberstein, 15.12.1959
Letter, A.P. Ershov->La-Berto, 15.12.1959notifying of sending over the bibliography on storage devices made up on Academician Dorodnitsyn's request
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